Controlling device for water returned to boilers



G; F. GERDTS 2,064,795 CONTROLLING DEVICE FOR WATER RETURNED TO BOILERS Dec. 15, 1936.

. Filed Feb. 2, 1935 Patented Dec. 15, 1936 UNITED STATES PATENT OFFICE CONTROLLING DEVICE FOR WATER RETURNED T BOILERS Gustav Friedrich Gerdts, Bremen, Germany 1 Claim.

In apparatus for softening and treating feed water to which part of the boiler water is returned through a conduit provided for this purpose, dififi'culties are experienced very often when not enough or too much boiler water flows into the same, so that the chemical reaction or process can not be complete, or the loss of heat is abnormally great.

The reliability of operation of the treating apparatus is further quite seriously affected through the small bore of the gate for limiting the quantity of boiler water thus returning (frequently having an opening of only about 1 mm. in diameter), so as to be liable to clog at any time, more particularly so if the returning boiler water is muddy. Whenever such clogging occurs the return flow ceases or becomes so slight as to upset the process of reaction. The boiler water is in consequence not sumciently softened and scale is likely to be formed.

All these and other difliculties are obviated through my invention, which consists mainly in providing, in a casing, following the throttling gate for regulating the inflow of the boiler water,

5 a second throttling gate which, according to the invention, has such an area of flow that a pressure is maintainable in the space between the two throttling gates higher than that in the pipe leading to the treating apparatus, but lower than the pressure in the pipe from the boiler to the first throttling gate. The pressure in this intermediate space, depending on the quantity of the boiler water flowing through, is the greater the greater the flow of the boiler water is; in other 5 words, the greater the opening of the first throttling gate is. As the boiler pressure is also influencing the quantity of the boiler water passing through, it follows, that any fluctuations of the boiler pressure affect, correspondingly, the pres- 40 sure in the intermediate space.

Indeed all changes in the quantity of the boiler water thus returned are noticeable in said intermediate space. For instance, should the first throttling gate become clogged, the pressure in 5 the intermediate space would immediately sink rapidly in consequence. On the other hand, a stopping up of the second throttling gate would cause the pressure in the intermediate space to rise up to boiler pressure.

50 According to the invention a manometer or other pressure indicator is connected with the intermediate space for showing the condition under which the boiler water is returning to the treating apparatus. From such an instrument 55 may then also be seen at a glance whenever there is an increase or decrease in the quantity of the returning boiler water. Besides, should one of the two throttling gates cease to function, this would at once become evident; furthermore, the manometer, etc. would at the same time indicate 5 which one of the two throttling gates is out of operation.

In the accompanying drawing:-

Fig. l is a longitudinal, vertical section of a form of my device with vertical passages, partly 10 broken away.

Fig. 2 is an outside view of the device shown in Fig. 1.

In the form of my device shown in Fig. 1, casing a comprises throttling gate I controlled by cone 0 15 of screw 11 and throttling gate II controlled by screw it, through which the boiler water passes in the direction of the arrows and through outlet 9 to the water treating apparatus (not shown).

The area of flow of throttling gate I which is 20 provided with a pointer and scale to indicate the amount of opening the gate is adjustable, to pass so much of the boiler water as required, according to chemical analysis, whilst the area of flow of throttling gate II, after having been deter- 5 mined does not require further adjustments, even if the adjustment of throttling gate I should have to be altered.

A pressure indicator i of the diaphragm pressure gage type is directly connected with the part 30 of the casing closest to and covering intermediate space e in a more or less self-contained manner.

A supplementary valve or gate, controlled by valve member q, as III, having two coaxial seats, is provided for stopping any inflow if it is desired to dismount the pressure indicator, or the two throttling gates, during operation under full working pressure. This supplementary valve permits also of drawing off water, for instance for the purpose of chemical analysis, through spout r, when the valve member q is in the closed position.

The area of flow of throttling gate II is such that the pressure in the intermediate space is about midway between that in the boiler and that in pipe s, so that clogging in gate I causes a material drop of the pressure in the intermediate space, whilst clogging of gate II causes the pressure in the intermediate space to be raised to that in the boiler.

The dial of the manometer is marked at both end positions in red or in another striking manner. The index or pointer approaching either end of the scale, this is indicative of a condition requiring immediate attention and remedy.

Having thus described my invention, What I claim is:- y

In a device for controlling the return flow of boiler water comprising in a casing, a chamber, a throttling gate for passing predetermined variable quantities of the returning boiler water into the chamber, a second throttling gate for regulating the outflow from the chamber at predeterminedly reduced variable pressures, means for indicating such variations of the pressure within the chamber so that thereby any clogging of any throttling gate becomes ascertainable and an auxiliary throttling gate having a plunger-like valve member and two coaxial seats for the same one opposite the other, so that predetermined variable quantities of water may be discharged from the device before entering the chamber, independent of the quantity of the water entering the chamber.

GUSTAV FRIEDRICH GERDTS. 

